I have a comet that is rusted something terrible. I heard about this Chassis Saver Rust Preventative Paint on Trucks TV. They say it is as good if not better than POR15. It sells for $68 a gallon and $24 quart, thats a lot cheaper than POR. The company that manufactures Chassis Saver also makes paint, clear coats and reducers. Has anyone tried any of these products? http://www.magnetpaints.com/underbody.asp